6409309 has 8 divisors (see below), whose sum is σ = 6533120. Its totient is φ = 6286896.

The previous prime is 6409307. The next prime is 6409321. The reversal of 6409309 is 9039046.

6409309 = 51² + 52² + ... + 268².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6409309 - 2¹ = 6409307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6409303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13612 + ... + 14074.

It is an arithmetic number, because the mean of its divisors is an integer number (816640).

Almost surely, 2^6409309 is an apocalyptic number.

It is an amenable number.

6409309 is a deficient number, since it is larger than the sum of its proper divisors (123811).

6409309 is a wasteful number, since it uses less digits than its factorization.

6409309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 6409309 is about 2531.6613122612. The cubic root of 6409309 is about 185.7535275486.

The spelling of 6409309 in words is "six million, four hundred nine thousand, three hundred nine".